thomas



(No Model.)

' H 0. THOMAS.

INSULATED METALLIC ROOF;

N0. 283,166. Patented Aug. 14, 1883.

WITNESSES INVENTOR m %4 WM 4 7 BY ATTORNEYS.

N PETERS. mowmm n ner. Wanhington. D. C

UNITED STATES PATENT OFFICE.

HENRY c. THOMAS, or noon VIEW, NEW YORK.

INSULATED METALLIC ROOF.

SPECIFICATION formingpart of Letters Patent No. 283,166; dated August14, 1883,

Application filed May 17. 1883. (No model.)

To all whom it may concern.-

Be it known that I, HENRY O. THOMAS, of Rock View, in the. county ofOattaraugus and State of New York, have invented a new and ImprovedInsulated Metallic Roof, of which the following is a full, clear, andexact description.

The invention consists in a metallic tank with an insulated roofconnected with the ground by a lightning-rod, as hereinafter described.

Reference is to be had to the accompanying drawings, forming part ofthis specification, in which similar letters of reference indicatecorresponding parts in both the figures.

Fig. 1 is a plan View of the tank provided with my improved insulatedroof, parts being broken out and others shown in section; and Fig. 2 isa cross-sectional elevation of the same, parts being broken out.

The roof is constructed with wood or iron rafters A, on which boards Bare secured, which boards extend to the outer edge of an angleiron, 0,secured to the top of the outer surface of the tank D, or building.sheathing, E, is tacked on the boards, then lapped over the edge Cof theangle/iron, and lapped against the outer side and bottom edge of awooden strip, F, held to the bottom of the horizontal flange of the angle-iron by bolts.

G passed through the said flange and strips, as shown. The edge of theasbestus sheathing is tacked to the strip F. The heads of the bolts G'are below the asbestus sheathing, and are countersunk in the uppersurface of the horizontal flange of the angle-iron.

An asbestus A sheet-ir6n covering, H, is placed 011 the sheathing E, andprojects beyond and down over the edge of the angle-iron. A series ofconductors, J, extend over the roof, and are connected with the edges ofthe metal covering H, and are carried down to the ground and connectedto a gas-pipe, K, surrounding the tank and, buried in the ground. Aconductor extends from the pipe K to marshy or other moist ground.

The asbestus insulator makes the tank fireproof, and is a perfectelectricity-insulator.

mediately pass down the conductors J, it will pass down the metalcovering H, and then through the conductors to the pipe K. The lightningwill not leave the good metalv conductor and pass through'the asbestusnon-conductor or insulator. Likewise it is not apt to leave the goodmetal conductor and pass through the wooden. strip F.

I am aware that it is not broadly new to con nect a metallic roof withthe ground by a lightning-rod; but

WVhat I do claim as new, and of my invention, is

A metallic tank having its roof insulated and connected with the groundby a lightningrod, substantially as shown and'described.

HENRY O. THOMAS \Vitnesses: I

J OHN MILLER, J osnrn PRESACK.

1f lightning strikes the tank and does not im-

